'r'	    Open for reading only; place the file pointer at the beginning of the file.

'r+' 	Open for reading and writing; place the file pointer at the beginning of the file.

'w' 	Open for writing only; place the file pointer at the beginning of the file and truncate the file to zero length. If the file does not exist, attempt to create it.

'w+' 	Open for reading and writing; place the file pointer at the beginning of the file and truncate the file to zero length. If the file does not exist, attempt to create it.

'a' 	Open for writing only; place the file pointer at the end of the file. If the file does not exist, attempt to create it.

'a+' 	Open for reading and writing; place the file pointer at the end of the file. If the file does not exist, attempt to create it.

<?php
	function read_file_in_array($filePath)
	{
		$file = fopen($filePath, "r");
		$lines = array();
		while(!feof($file))
		{
			$lines[] = fgets($file);
		}
		fclose($file);

		return $lines;
	}
 ?>
 

<?php
	write_file($base_dir_path, $data_to_add, 'a+');

	function write_file($path, $data, $mode)
	{
		if ( ! $fp = @fopen($path, $mode))
		{
			return FALSE;
		}

		flock($fp, LOCK_EX);
		fwrite($fp, $data);
		flock($fp, LOCK_UN);
		fclose($fp);

		return TRUE;
	}
?>

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